Desktop USB charger



FIG. 1 is a top, front right-side perspective of my new design for a desktop USB charger,

FIG. 2 is a left-side elevation thereof,

FIG. 3 is a right-side elevation thereof,

FIG. 4 is a front elevation thereof,

FIG. 5 is a rear elevation thereof,

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof. 

CLAIM I claim the ornamental design for a desktop USB charger, as shown and described. 